Chickens absolutely LOVE free-range - like letting children loose onto a playground. If you can get a hose out to the free-range wet an area down and they'll have a blast digging in the wet soil. Set up some plywood planks on cinderblocks or a couple recycled large doghouses or a popup canopy with legs buried a foot into the ground for shade/snoozing/hiding areas from aerial predators. The hawks won't go after hiding chickens. We have rose bushes that our hens like to hide under besides a wheelbarrow and plywood shelters set on cinderblocks and a popup canopy. Our Cooper's Hawk (chicken hawk) won't go after our hiding girls. I guess they prefer swooping down on a running chicken in an open yard so we set up shelters all around for chickens to duck for cover. With those shady trees you probably have occasional predators stalking your girls and the shelters will provide them cover during their barnyard alerts. Love your barnyard brick red coop.